DFIP AREA PLANNING NORTH AND SOUTH 1(109)

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2 The provision of "merging target procedures" to mitigate the effects of severe turbulence and/or MWA is not optional for the controller, but rather is a priority responsibility. Pilot requests for vectors for traffic avoidance when encountering MWA or pilot reports of "Unable RVSM due turbulence or MWA" are considered first priority aircraft separation and sequencing responsibilities. (FAA Order 7110.65, paragraph 2-1-2 states that the controller's first priority is to separate aircraft and issue safety alerts).
3 EXPLANATION OF THE TERM "TRAFFIC PERMITTING" - The contingency actions for MWA and severe turbulence detailed in following paragraphs, state that the controller will "vector aircraft to avoid merging targets with traffic at adjacent flight levels, traffic permitting." The term "traffic permitting" is not intended to imply that merging target procedures are not a priority duty. The term is intended to recognize that, as stated in FAA Order 7110.65, paragraph 2-1-2, there are circumstances when the controller is required to perform more than one action and must "exercise their best judgment based on the facts and circumstances known to them" to prioritize their actions. Further direction given is: "That action which is most critical from a safety standpoint is performed first."
(d)
TCAS SENSITIVITY - For both MWA and severe turbulence encounters in RVSM Airspace, an additional concern is the sensitivity of collision avoidance systems when one or both aircraft operating in close proximity receive TCAS advisories in response to disruptions in altitude hold capability.

(e)
PRE-FLIGHT TOOLS - Sources of observed and forecast information that can help the pilot ascertain the possibility of MWA or severe turbulence are: Forecast Winds and Temperatures Aloft (FD), Area Forecast (FA), SIGMETS and

PIREPS.

(f) PILOT ACTIONS WHEN ENCOUNTERING WEATHER (e.g., Severe Turbulence or MWA)
1 WEATHER ENCOUNTERS INDUCING ALTITUDE DEVIATIONS OF APPROXIMATELY 200' - When the pilot experiences weather induced altitude deviations of approximately 200', the pilot will contact ATC and state "Unable RVSM Due (state reason) (e.g., turbulence, mountain wave). See contingency actions in paragraph j.
2 SEVERE TURBULENCE (including that associated with MWA) - When pilots encounter severe turbulence, they should contact ATC and report the situation. Until the pilot reports clear of severe turbulence, the controller will apply merging target vectors to one or both passing aircraft to prevent their targets from merging:
Pilot: "Yankee 123, FL310, unable RVSM due severe turbulence".
Controller: "Yankee 123, fly heading 290; traffic twelve o'clock, 10 miles, opposite direction; eastbound MD-80 at FL320"; (or the controller may issue a vector to the MD-80 traffic to avoid Yankee 123)
3 MWA - When pilots encounter MWA, they should contact ATC and report the magnitude and location of the wave activity. When a controller makes a merging targets traffic call, the pilot may request a vector to avoid flying directly over or under the traffic. In situations where the pilot is experiencing altitude deviations of 200' or greater, the pilot will request a vector to avoid traffic. Until the pilot reports clear of MWA, the controller will apply merging target vectors to one or both passing aircraft to prevent their targets from merging:
　
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